ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Sheng Sheng,Jingjing Fu,Siyuan Song,Yuxuan He,Jin Qian,Ziyang Yi
The increasing use of fluoroquinolone antibiotics, which are found in various environmental media, is a constant threat to ecological safety and human health. In this paper, SrFeO3@MoS2 heterogeneous catalyst was prepared to activate peroxymonosulfate (PMS) for the degradation of levofloxacin (LVO). The characteristics of SrFeO3@MoS2 samples were studied and the optimum conditions for the removal of LVO by SrFeO3@MoS2/PMS system were investigated. The removal of LVO by the SrFeO3@MoS2-0.3/PMS system could reach 96.06% within 20 min of reaction. The effect of inorganic anions (SO42−, Cl−, NO3− and H2PO4−) commonly found in actual water bodies on catalytic reaction was explored. The reusability investigation revealed that the catalyst could still remove 88.06% of LVO within 20 min after four cycles. Moreover, SO4•−, •OH and 1O2 were identified by Electron Paramagnetic Resonance (EPR) tests and scavenger experiments, where the SO4•− and •OH were dominant reactive species. Combining with the XPS characterisation, the activation mechanism of SrFeO3@MoS2-0.3/PMS was proposed, and the oxygen vacancies and transition metals on the sample surface were active sites of PMS activation. Furthermore, the possible degradation pathways of LVO were well-established based on the detected intermediates.
研究领域:
环境科学
·
催化材料
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 47
·57822-57831
·
IF 0
Liu Yifan,Xu Zhuangqin,He Yuting,Liu Minghua,Lin Chunxiang,Lv Yuancai
A synergistic photocatalytic system based on Fe-based perovskite with persulfate was constructed for alkali lignin (AL) degradation in pulp and paper wastewater. The degradation performance and mechanism on AL were carried out under ambient temperature and pressure, accompanied by visible light irradiation. The results showed that the synergistic photocatalytic system exhibited much better performance on AL degradation than the single catalytic system. The degradation efficiency reached 73.5% under the optimal conditions and was constant at around 65% over the pH range from 2 to 8. A significant escalation of the AL degradation was observed at pH 10, reaching 80.1%. The photogenerated holes, 1 O 2 and SO 4 − ·, generated by the system were involved in the degradation, and the holes played a dominant role. During the degradation process, the efficient promotion of cleavage events in lignin methoxy, β -O-4 bond, and benzene ring was observed. Consequently, the depolymerization process led to the generation of high-value compounds, namely p -hydroxybenzaldehyde and vanillin. Remarkably, the yields of the high-value compounds in the synergistic photocatalytic system were five times larger than those in the control. This study offered a viable method to activate persulfate for alkali lignin degradation and to achieve a mutually beneficial strategy for wastewater treatment and recycling.
研究领域:
环境科学
·
废水处理工程
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhenqiang Yu,Yihao Xu,Rong Guo,Jinming Zeng,Zheng Xie,Menglian Zhang,Yi Fang,Xiaopeng Qi,Zhe Lü,Huan Li
The development of highly active and durable cathode is a pivotal factor for fully unlocking the commercial potential of solid oxide fuel cells (SOFCs). Herein, the La 0.5 Ba 0.5-x FeO 3-δ ( x = 0, 0.01) oxides were prepared, and the impacts of A-site deficiency were studied in detail. The introduction of A-site defects leads to lattice contraction of the cubic perovskite structure and lower thermal expansion coefficient. Introducing A-site deficiency into La 0.5 Ba 0.5 FeO 3-δ yields more oxygen vacancies and higher electrical conductivity. Compared with La 0.5 Ba 0.5 FeO 3-δ material, the La 0.5 Ba 0.49 FeO 3-δ achieves the lowest polarization resistance of 0.089 Ω cm 2 and the maximum power density of 464 mW cm 2 at 750 °C, while performing exceptional stability for a duration of 100 h. Moreover, the oxygen partial pressure dependence and the distributions of relaxation times analyses effectively identify the rate-limiting steps of the overall oxygen reduction process. These results indicate that the La 0.5 Ba 0.49 FeO 3-δ oxide is a high-performance cathode catalyst material for SOFCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Bayu Admasu Beshiwork,Xinyu Wan,Min Xu,Haoran Guo,Birkneh Sirak Teketel,Yu Chen,Jun Song Chen,Tingshuai Li,Enrico Traversa
The sluggish kinetics of the electrochemical oxygen reduction reaction (ORR) in intermediate-temperature solid oxide fuel cells (IT-SOFCs) greatly limits the overall cell performance. In this study, an efficient and durable cathode material for IT-SOFCs is designed based on density functional theory (DFT) calculations by co-doping with Nb and Ta the B-site of the SrFeO 3− δ perovskite oxide. The DFT calculations suggest that Nb/Ta co-doping can regulate the energy band of the parent SrFeO 3− δ and help electron transfer. In symmetrical cells, such cathode with a SrFe 0.8 Nb 0.1 Ta 0.1 O 3− δ (SFNT) detailed formula achieves a low cathode polarization resistance of 0.147 Ω cm 2 at 650 °C. Electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS) analysis confirm that the co-doping of Nb/Ta in SrFeO 3− δ B-site increases the balanced concentration of oxygen vacancies, enhancing the electrochemical performance when compared to 20 mol% Nb single-doped perovskite oxide. The cathode button cell with Ni-SDC|SDC|SFNT configuration achieves an outstanding peak power density of 1.3 W cm −2 at 650 °C. Moreover, the button cell shows durability for 110 h under 0.65 V at 600 °C using wet H 2 as fuel.
研究领域:
材料科学
·
电化学
·
能源工程
·
无机非金属材料
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xiaowei Kong,Xiaoliang Zhou,Yu Tian,Xiaoyan Wu,Jun Zhang,Wei Zuo,Xiaobo Gong,Zhanhu Guo
A novel La 0.9 Ca 0.1 Fe 0.9 Nb 0.1 O 3-δ (LCFNb) perovskite for solid oxide fuel cells (SOFCs) anode is prepared by means of the citrate-nitrate route and composited with Ce 0.8 Sm 0.2 O 1.9 (SDC) by impregnation method to form nano-scaled LCFNb/SDC anode catalytic layers. The single cells with LCFNb and LCFNb/SDC impregnated anodes both achieve relatively high power output with maximum power densities (MPDs) reaching up to 610, 823 mW·cm −2 in H 2 at 800 °C, respectively, presenting a high potential of LCFNb for use as SOFCs anode. The power outputs of the single cells with LCFNb/SDC composite anode in CO and syngas (CO H 2 mixture) are almost identical to that in H 2 at each testing temperature. This composite anode also presents excellent durability in both H 2 and CO for as long as 50 h, showing desirable anti-reduction and carbon deposition resistance abilities. Besides, the cell output is stable in 100 ppm H 2 S H 2 atmospheres for 20 h at a current density of 600 mA·cm −2 with negligible sulfur accumulation on the anode surface . Hence, a novel iron based perovskite LCFNb anode with remarkable cell performance, carbon deposition resistance and sulfur poisoning tolerance for SOFCs is successfully obtained.
研究领域:
材料科学
·
电化学
·
能源材料
·
无机非金属材料
·
功能陶瓷
·
清洁能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）